<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="http://www.baidu.com">
    <!--maxlength最大字符长度
     value设置默认值
     readonly只读-->
   用户名:<input type="text" name="username" maxlength="5"
        value="abc" readonly ><br>
    密码:<input type="password" name="password"><br>
    <!--value是单选框必须添加的属性 否则提交on
    checked默认选中-->
    性别:<input type="radio" name="gender" value="m" id="r1">
    <label for="r1">男</label>
    <input type="radio" name="gender" checked value="w">女<br>
    兴趣爱好:<input type="checkbox" name="hobby" value="cy">抽烟
    <input type="checkbox" name="hobby" checked value="hj">喝酒
    <input type="checkbox" name="hobby" value="tt">烫头<br>
    生日:<input type="date" name="birthday"><br>
    靓照:<input type="file" name="pic"><br>
    所在地:
    <!--value设置提交的内容    selected默认选中-->
    <select name="city">
        <option value="bj">北京</option>
        <option value="sh">上海</option>
        <option value="gz" selected>广州</option>
    </select><br>
    <input type="submit" value="注册">
</form>
</body>
</html>